TREASURE CHEST

All treasure chests require the lock pick to open. Once you have acquired this tool, fast travel to the Ruined Tower Base Camp. You're headed for the large pool to the east, shown in this map detail. You can approach from either direction, but we'll head northeast, past the campfire, through the cave, and across the fallen log, to emerge on a ledge overlooking the pool. Dive in and swim to the northeast side. There's a partially submerged cave opening here. Swim through and climb up to the ledge with the treasure chest and document #16. The chest contains an Artifact, a Warrior Pendant from the Cult of Kukulkan Story.

To get back to camp, swim across to the northwest side of the pool, scale the climbable wall, and return through the cave and across the fallen log the way you came. You can then use the base camp to fast travel out to wherever you left off. (Click images for more and larger screenshots.)

RELIC 2 - Faded Writing (The Missionary)

This relic is on the way to the wolf den and crypt entrance south of the mission. Start at the Mission Gate Base Camp and follow the road across the bridge to the southeast. Just beyond the carved stone heads and metal cross, turn right (south). Head down the slope and you'll find the relic on an altar on the left, just before the gap in the cliffside. (Click image for more and larger screenshots.)

RELIC 4 - Decorated Crucifix (The Missionary)

This relic is near the crumbling bell tower south of the mission. If you missed it, fast travel to the Ruined Tower Base Camp. Then head southwest toward the river. Near the flagpole is a broken wooden bridge. Jump across the water here and you'll find the relic on the other side. (Click image for more and larger screenshots.)

RELIC 6 - Mission San Juan (Miracle Mission)

This relic is sitting on a small altar next to the Deserted Cloister Base Camp. That's the camp near the entrance to the Tree of Life Challenge Tomb. If you haven't discovered this camp yet, start at the Ruined Tower Base Camp and follow the main walkthrough. You'll also find archivist map #4 in this area. (Click screenshot to enlarge.)

RELIC 9 - Primitive Doll (Handmade Dolls)

This relic is in the Thirsty Gods Challenge Tomb. If you haven't explored the tomb yet, fast travel to the Deserted Cloister or Ruined Tower Base Camp. Then follow the main walkthrough.

If you raided the tomb but missed the relic, fast travel to the Flood Basin Base Camp. Go through the doorway to the west at ground level (or, if you didn't pull down the wooden barrier earlier, climb the ladder) to reach the water wheel cavern. Then hop across the floating platforms to the north side of the pool, in order to avoid the piranhas. Swim along close to the west wall (the piranhas avoid this area) and into the submerged doorway below the waterwheel. The relic is inside the flooded room on the left. (Click first and second screenshots for visuals.)

To get back to the base camp, you'll need to raise the water level if you haven't already done so. Swim back to the floating platform on the north side of the pool. Climb the wall on the left and make your way along the ledge to the rotating handle in the southwest corner. Turn the handle counterclockwise and the pool should begin to fill. Then swim back along the west wall to the floating platform on the north side of the pool. Hop across the platforms to the southeast corner and go through the doorway. (Use a rope arrow to pull down the barrier if necessary.) The base camp is just ahead. From here, you can fast travel to wherever you need to go next. (Click third screenshot for details.)